Of course, this tutorial only applies to jailbroken phones.
To add a source:
1. Open Installer.
2. Tap the “Sources” icon at the bottom right side of the screen.
3. Tap the “Edit” icon.
4. Tap the “Add” icon that now appears at the top left hand side of the screen.
5. An “Add Source” window will pop up. Add the desired source.
6. Tap “OK”
The Installer will refresh its sources.
Your source is added.
